I have the rear seat already but there are no captive nuts for any of the bolts needed to bolt the seat to the floor or even mount the seat belts on the qtr panels. Only captive nuts i have found are in the wheel arch.
Our GQ has the third seat, I find it strange that the seat belt mount's are in yours.onsidering you have one but not the other..?
1, one in the wheel arch, the other is hi at the top of the back quarter up near the roof.
you might have to remove the plastic trim,and the buckle is attatched to the seat , so no mount needed.(except for the seat).
We use ours all the time as we have 3 active boys who always have a ring in.
So for day trips we bought an eski that fits between the rear seat and door and just "play tetris".
I took us a while, but you will manage. You might have a few grumbles at first but you will.
Cheers Ian.